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HomemadeTurbo - DIY Turbo Forum (https://www.homemadeturbo.com/)
-   Forced Induction (https://www.homemadeturbo.com/forced-induction-7/)
-   -   How much degrees & how much boost? (https://www.homemadeturbo.com/forced-induction-7/how-much-degrees-how-much-boost-21059/)

turboboy 05-26-2004 12:17 PM
Re:How much degrees & how much boost?
 
Originally Posted by chingro4u
Originally Posted by ghettoturbo
point for semnos...the btm would retard the timing in boost, which wont solve the afc's problem of vacuum and low-boost timing advance
but isn't low boost still boost?

from what i am reading here, you guys are saying the BTM only work at high/full boost.

I am just curious about all this, i will be using uberdata within a week or two.
think of it this way....you would have to ask someone else for specifics, but at low boost the afc is advancing your timing, and if you had a btm, you could retard it some to maybe compensate. but now, as the boost goes up, youre retarding more, and so is the ecu, meaning your car will run like ass

Spenser 05-26-2004 02:25 PM
Re:How much degrees & how much boost?
 
Originally Posted by StanB

Spenser, thanks a million. I already have a VAFC. I bought it because I read that it was OK if I was not going to boost over 8psi. I guess I am stuck with it for a while. I also have an extra P28 ECU. Who would you recommend to chip it for me?

Thanks to everyone else that responded.
sorry man, I don't know anything about P28, all i know how to chip is obd0 (PM6) make a post in the engine management section, and read some more about chipping, it's actually really easy to do it yourself, you seem like a smart person, i bet you could do it.

StanB 05-26-2004 03:11 PM
Re:How much degrees & how much boost?
 
So if the ECU is retarding the timing at high boost, it would be best if I retard the timing by a modest amount...6 degrees from stock which is 16 degrees BTDC. So, when the ECU advance the timing in low boost, the increase will be cancelled by the amount it is retarded in high boost. Is my assessment a good one?

StanB 05-26-2004 03:12 PM
Re:How much degrees & how much boost?
 
Spencer, thanks again for the feedback. I will do some more reading.

chingro4u 05-26-2004 03:15 PM
Re:How much degrees & how much boost?
 
i am about to chip my P28, so if you want i can tell you what to get and how to do it, but remember it is my first time. :-\

turboboy 05-27-2004 08:58 AM
Re:How much degrees & how much boost?
 
Originally Posted by StanB
So if the ECU is retarding the timing at high boost, it would be best if I retard the timing by a modest amount...6 degrees from stock which is 16 degrees BTDC. So, when the ECU advance the timing in low boost, the increase will be cancelled by the amount it is retarded in high boost. Is my assessment a good one?
kinda..people do retard at the dizzy to compensate for the afc, but its just not the best setup since you will end up with very retarded (no pun) timing up high from what i understand

StanB 05-27-2004 12:11 PM
Re:How much degrees & how much boost?
 
Thanks man.

d16forlife 05-27-2004 07:42 PM
Re:How much degrees & how much boost?
 
I just retarded my cam gear 3*.Havent had a problem with detonation yet ;)

StanB 05-28-2004 01:21 AM
Re:How much degrees & how much boost?
 
Originally Posted by d16z64life
I just retarded my cam gear 3*.Havent had a problem with detonation yet ;)
I don't think retarding the cam gear will affect detonation. Advancing or retarding the cam gear will only affect the power output. Retarding the cam gear will reduce low down power but it ncrease top end speed...advancing the cam gear is the opposite ;).


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